Darkness Awakened by Stephanie Rowe (self-pubbed title by traditionally published author)

Quote:

The Calydons are a race of ancient immortals cursed with a dark side. Each Calydon is destined to meet his soul mate, to be so drawn to her that he is unable to resist bonding with her through the rituals of his race...

...but their destiny is to destroy each other and all they care about the moment their bond is complete.

Quinn Masters will stop at nothing to rescue his rogue teammate. To save his blood brother and ensure his brand of justice triumphs, Quinn will break every rule of his kind and partner with the sensuous, courageous woman destined to be his ultimate destruction.

Haunted by a brutal past, Illusionist Grace Matthews will risk everything to save her kidnapped sister, including putting her life in the sinfully capable hands of an immortal warrior whose ravaging kisses and intense passion propel her ruthlessly toward a fateful destiny she can't afford to believe in.